/*
 * Copyright 2010 Christoph Widulle (christoph.widulle@googlemail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
 * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */



package com.android1.amarena2d.commons.collections;

public abstract class FixedSizeQueuePool<T> {

    private FixedSizeQueue<T> pool;

    private static final int DEFAULT_SIZE = 32;

    public FixedSizeQueuePool() {
        super();
        create(DEFAULT_SIZE);
    }

    public FixedSizeQueuePool(int size) {
        super();
        create(size);
    }

    public T acquire() {
        T result = pool.poll();
        assert result != null : "Object pool of type " + this.getClass().getSimpleName() + " exhausted!!";
        return result;
    }

    public void release(T entry) {
        if (!pool.contains(entry))
            pool.add(entry);
    }

    private void create(int size) {
        pool = new FixedSizeQueue<T>(size);

        for (int i = 0; i < size; i++) {
            pool.add(newElement());
        }
    }

    protected abstract T newElement();

}